File types blocked in Gmail

There are a number of reasons why you may see the "This message was blocked because its content presents a potential security issue" error in Gmail. Gmail blocks messages that may spread viruses, like messages that include executable files or certain links.

Types you can't include as attachments

To protect your account, Gmail doesn't allow you to attach certain types of files. Gmail often updates the types of files not allowed to keep up with harmful software that is constantly changing. Some examples include: